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结合实验研究,分析了碳合金化对高温钛合金显微组织、高α+β相区、时效过程中α2和硅化物析出的影响机制及其碳化物的稳定性。α+β相区再结晶,碳化物主要在β转变组织中析出以及碳化物的百分数取决于初生α(αp)体积分数;β相区热处理,碳化物的析出阻碍β晶粒的长大。碳的加入延缓αp体积分数随温度的变化速度,扩大高温钛合金的高α+β相区;同时降低αp相Al的浓度,增加β转变组织中Al和Mo的浓度,导致αp相内α2颗粒直径逐渐减小,颗粒间距增大。β相与碳化物之间的包析反应是碳化物溶解的主要动力。
In combination with experimental studies, the effects of carbon alloying on the microstructure and high α + β phase of high temperature titanium alloy and the effect of α2 and silicide precipitation during aging and the stability of carbides were analyzed. The α + β phase region recrystallizes. The carbide precipitates mainly in the β transformation structure and the percentage of carbides depends on the volume fraction of primary α (αp). The heat treatment in the β phase region and the precipitation of carbides prevent the growth of β grains. The addition of carbon slows the rate of change of αp volume fraction with temperature and enlarges the high α + β phase region of high temperature titanium alloy. At the same time, the concentration of Al in αp phase decreases and the concentration of Al and Mo in β transformation increases, Diameter decreases gradually, the particle spacing increases. The inclusion reaction between β phase and carbides is the main driving force for carbides dissolution.